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7. Modbus register
This chapter provides a complete description of the Modbus register for the
MRCDB300/RCMB300 series to allow access to information.
The following Modbus function codes are supported
• Holding register for reading out values
(Read Holding Register; function code 0x03)
• Register for device programming
(Write Multiple Registers; function code 0x10)
• Register for diagnostic functions
(Diagnostic; function code 0x08)
• Register for event counter
(Get Com Event Counter; function code 0x0B)
• Register for server ID
(Report Server ID; function code 0x11)
• Register for device identification
(Read Device Identification; function code 0x2B)
For a complete Modbus protocol specification, visit
http://www.modbus.org.
7.1 Overview
7.1.1 Read and write accesses
7.1.2 Formats used
RO READ ONLY (read access only)
RW READ / WRITE (read and write access)
WO WRITE ONLY (write access only)
Float32 IEEE754 32-bit (single precision floating point number)
INT16 Signed 16-bit integer
INT32 Signed 32-bit integer
UINT16 Unsigned 16-bit integer
UINT32 Unsigned 32-bit integer
String-UTF8 ASCII character string
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